Warming device



N 1952 H. R. JORG-ENSEN WARMING DEVICE Filed March 15 1950 INVENTOR. fimMAA/RJmM/vmv, W

Patented Nov. 4, 1 952 UNITED STATES PATENT OFFICE WARMING DEVICE Herman Ray J orgensen, Pasadena, Calif.

Application March 15, 1950, Serial No. 149,755

2 Claims. 1

This invention relates to a warming device and it is primarily an object of the invention to provide an article of this kind especially designed and adapted for use by animals.

It is also an object of the invention to provide an article of this kind in the nature of a bed including electrical heating means having a normally open operating circuit together with means whereby the weight of the animal occupying the device effects the closing of the circuit.

Furthermore it is an object of the invention to provide a device of this kind embodying the use of a plurality of heating media which automatically become inoperative at varying temperatures.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved warming device whereby certain advantages are attained, as will be hereinafter more fully set forth.

In order that my invention may be better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is a vertical sectional view taken substantially on the line I-I of Figure 2;

Figure 2 is a view in top plan of the device as herein comprised with a portion broken away and parts indicated by broken lines; and

Figure 3 is diagrammatic view of the heating elements as herein comprised.

In the embodiment of the invention as illustrated in the accompanying drawings, T denotes a tray-like base member of preferred dimensions and depth and preferably of metal. Within the lower portion of the tray T is a bed I of a material that is a heat and electrical insulator and upon which rests a heating unit A which snugly fits within the tray T. At substantially the center of the body plate 2 of the heating unit A is a conventional type of single pole single throw normally open spring switch 3 including the upstanding operating lever 4 which is engaged from above by the free end portion of an elongated spring arm 5. The opposite end portion of the arm 5 is riveted, as at 6 or otherwise rigidly secured to a side wall I of the tray I.

The side walls 'I of the tray T have their upper margins defined by the outwardly disposed flanges 8 to which are suitably secured, as at 9, the marginal portions of a cover II). This cover I is preferably of metal and is made sufficiently over-size to allow flexing. The free end portion of the spring arm contacts from below with the central portion of the cover I0 and normally maintains said central portion in raised position as shown in Figure 1 of the drawings.

The switch 5a is interposed in one of the conductors a comprised in the circuit for the primary coil I3 of a transformer II. This transformer is of a conventional type to reduce the line voltage to twenty-four volts.

Carried by the body or plate 2 of the heating unit A are the heating elements I2 and I4. The element I2 is in electrical connection with the secondary coil I5 of the transformer II by the conductors b and c. Interposed in the conductor or leg 1) is a bimetal thermostat I6 set to open at F. Interposed in the conductor or lead 0 is a bimetal thermostat I! set to open at F.

The heating element I4 is interposed between the thermostats IE and I1 and is in electrical connection with the thermostat I6 through the conductor or leg d and with the thermostat I'I through the conductor or leg 6.

The transformer is herein disclosed as mounted upon a corner portion of the tray T and it is to be understood that the thermostats l6 and I I may be set to open at temperatures other than hereinbefore mentioned.

The conductors a extend exteriorly of the tray for connection with a desired source of electrical energy. The conductors a exteriorly of the tray are disposed through and around cable I8 to assure that an animal will be unable to bite into the conductors a.

Interposed in one of the conductors or legs a for the primary coil I3 of the transformer II is a fuse I9 of desired capacity and which is provided in the event of an electrical failure.

When the device is occupied by an animal, the weight of said animal will close the switch 3 whereupon the heating elements I2 and I4 will become effective. The element I2 may be referred to as an auxiliary heating element. When a temperature of 85 F. is reached or such other degree to which the thermostat I5 is set, the thermostat will open and the element I2 will cease to contribute heat. When the device attains a temperature of 95 F. or such or other degree to which the thermostat I1 is set, the thermostat I! will open and the element I4 will cease to contribute heat. It is to be noted that the wiring is so arranged that if there should be a failure in thermostat IS, the opening of the thermostat I! will deenergize both heating elements I2 and I4.

Disposed over the body plate 2 of the heating unit A is a thin sheet 20 of asbestos or the like.

From the foregoing description it is thought to be obvious that a warming device constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated.

- I claim:

1. A device of the character described comprising a tray-like base member having side walls, a flexible cover overlying'the top face of the member and secured to the walls thereof, a spring arm underlying the cover and having one extremity secured to one of the side walls, the opposite extremity terminating at the central portion of the.

cover, an electrical heating unit within the traylike member, an operating circuit therefor, a

normally open switch interposed in said circuit,

and an operating lever for the switch engaging the spring. arm from below whereby depression of the cover and arm will move the lever to close the switch.

2. A device or the character described comprising a body member of, insulation material, two: electrical heating elements carried byand ov-erlyingthe-b-ody member, a main circuit for one of the elements, a circuit for the second element in parallel with the main circuit, a nor-, mally closed thermostatic switch interposed in each of the circuits, the switch in the main circuit opening at a lower temperature than the switch in the parallel circuit, a current supply circuit including a primary winding of a transformer, the secondary of the transformer being in said main circuit, a control switch interposed in the current supply circuit, and a shiftable mean-s overlying the body member and operatively coupled with the control switch for closing the same, oneof said thermostatic switches being common tothe circuits for the two electric heating elements.

HERIVIAN RAY JORGENSEN.

REFERENCES CITED The .following references are of record in the file of this patent:

UNITED STATES PATENTS Number. Name. Date.

836,282.. Shellhamer Nov. 20,1906- 1,096,916 Hoffman M ay.19, 1914. 1,661,354 Ayre Mar. 6,1928. 1,758,117 Skinner May. 13, 1930 2,307,833 Ferris Jan. 12, 1943 2,410,014 1 Clark Oct.29, 1946 2,427,945; Clark etal Sept. 23, 1947 

